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Dynamics of electrically charged transient evaporating sprays
Author(s) -
Shrimpton John S.,
Laoonual Yossapong
Publication year - 2006
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.1647
Subject(s) - ignition system , mechanics , evaporation , spray characteristics , engine knocking , transient (computer programming) , automotive engineering , spark ignition engine , materials science , plume , injector , fuel injection , environmental science , gasoline direct injection , chemistry , meteorology , mechanical engineering , engineering , aerospace engineering , physics , homogeneous charge compression ignition , combustion , spray nozzle , computer science , combustion chamber , organic chemistry , nozzle , operating system
Abstract The evolution of an evaporating spray plume typical of those under consideration for use in direct injection spark ignition (DISI) engines, for early and late fuel injection strategies is investigated. Here the effect of electric charge, present on individual drops, upon the spray dispersal and evaporation rate is investigated with the aim of optimizing these parameters with respect to typical engine timescales and injection strategy. The predictions suggest that applying electric charge to drops in sprays injected early into the intake stroke does not have a beneficial effect. The spray evaporation rate is not significantly enhanced, and the long time interval between fuel injection and ignition actually promotes spray wall deposition. Conversely, applying electric charge to sprays injected late encourages secondary atomization and the increase in surface area greatly improves the evaporation rate. This is also true at higher engine speeds, corresponding to a much reduced time between fuel injection and ignition. Therefore it is suggested that the selective use of electric charge is viable way of tuning the spray character without effecting fuel metering when moving from an early to a late injection strategy in DISI engines when variable loads are required. Copyright © 2006 John Wiley & Sons, Ltd.